Autocrat

n.	1.	An absolute sovereign; a monarch who holds and exercises the powers of government by claim of absolute right, not subject to restriction; as, Autocrat of all the Russias (a title of the Czar).
	2.	One who rules with undisputed sway in any company or relation; a despot. The autocrat of the breakfast table. - Holmes.

Noun

1.

autocrat - a cruel and oppressive dictator Synonyms: despot, tyrant

Simon Legree, absolute monarch, absolute ruler, all-powerful ruler, arrogator, autarch, caesar, commissar, czar, despot, dictator, disciplinarian, driver, duce, hard master, martinet, oligarch, oppressor, pharaoh, slave driver, stickler, usurper, warlord